Structural revisions of the reported A-ring phosphine oxide synthon for ED-71 (Eldecalcitol) and a new synthesis
作者:Guo-Dong Zhao、Zhao-Peng Liu
DOI:10.1016/j.tet.2015.08.055
日期:2015.10
for the synthesis of the ED-71 A-ring phosphineoxide, we discovered that unusual TBS transfer occurred from the 1α-position to the sterically more constrained 2β-position, and the subsequent Michael addition of ethyl acrylate predominated at the 1α-position. The X-ray analysis of a key intermediate confirmed our observations. We made a structural revision of the reported A-ring phosphineoxide synthon